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bracing slots in sides?

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Joe Sallis

Post subject: bracing slots in sides?

Posted: Tue Jul 03, 2012 2:52 pm

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Posts: 502
First name: joseph
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Rather than hijack Klookers last thread though I'd start a new one.
I asked why slotting braces into the sides was a bad for the sound and medlingfool replied

Quote:

Joe,

That only applies to the lower x's, the finger braces, and the tone bars.
Upper transverse and upper x ends should be notched into the sides or somehow supported.

The reason some people like to thin the lower braces to zero at the ends is to loosen the edge of the top for a bassier response.

I'm about to start an OM from Grellier's plans. He shows the braces tapering to 3mm (0.11 inches) at end and slotting into the kerfling in all places.
Am I right in thinking that tapering the lower braces into zero BEFORE they meet the kerfling will improve bass response? Does it not make the braces more likely to come unglued?

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bluescreek

Post subject: Re: bracing slots in sides?

Posted: Tue Jul 03, 2012 5:18 pm

Brazilian Rosewood

Joined: Mon Jan 28, 2008 5:21 am
Posts: 4916
Location: Central PA
First name: john
Last Name: hall
City: Hegins
State: pa
Zip/Postal Code: 17938
Country: usa
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Status: Professional

I am not a fan for going through the side to inlet bracing. If you let a sharp corner you can make a stress riser that can help a crack to form. Also chances of making this a perfect joint is slim , and the fact that wood will contract or expand across the grain and this can have the brace push the binding off .
I only inlet the kerfing.

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Clay S.

Post subject: Re: bracing slots in sides?

Posted: Tue Jul 03, 2012 8:52 pm

Brazilian Rosewood

Joined: Sun Mar 30, 2008 8:20 am
Posts: 5968

Hi Joe,
Your thinking is correct. Tapering the braces to zero before the linings will generally improve bass response (a good thing for an OM.). It may increase the chances of the ends of the braces coming unglued over those that are tucked under the linings, but by tapering them to "zero" the theoretical stress riser is reduced over that of a non tapered, untucked brace.

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Joe Sallis

Post subject: Re: bracing slots in sides?

Posted: Wed Jul 04, 2012 3:15 am

Contributing Member

Thanks for replies.
It' so good in this forum that you never know what you will learn next.

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bluescreek

Post subject: Re: bracing slots in sides?

Posted: Wed Jul 04, 2012 7:47 am

Brazilian Rosewood

I totally agree to fade any untucked brace to zero though I do for structural integrity tuck the main X and the truss rod brace. If you don't tuck the X at least tuck that truss rod brace as that takes the brunt of the force of the extension on the top.

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blues creek guitars
Authorized CF Martin Repair
Co President of ASIA
You Don't know what you don't know until you know it

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